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o For the Schiff’s test, aldehydes show a pink color while ketones don’t have any color at all.
o In Fehling’s test, there’s an occurrence of a reddish precipitate while in ketones there’s none.
o For Tollen’s test, a black precipitate is formed while in ketones there’s again none.
With the sodium hydroxide test, aldehydes show a brownish resinous material (except for formaldehyde) while ketones don’t have any reaction to such.
o For the reagent sodium nitroprusside plus some drops of sodium hydroxide, aldehydes emit a deep reddish color while ketones exhibit a reddish color which later transforms to orange.
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